Process for improved preparation of treatment gas in heat treatm

Details Process for improved preparation of treatment gas in heat treatm Process for improved preparation of treatment gas in heat treatm

1991-05-17

1992-11-03

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148559, 423239, 4232453, 423651, F27D 2300, C21D 100, C21D 900

Patent

active

051603802

ABSTRACT:
The invention relates to a process and apparatus for preparation of treatment gas used in heat treatments, whereby the treatment gas is produced in a furnace disposed catalyst retort at a temperature of that of the furnace in which the retort is positioned.
With such processes, when using lower furnace temperature ranges, problems occur with respect to the reaction of the feed gas in the catalyst retort. To provide an improvement, the catalyst retort in the furnace is surrounded by a shield, and the treatment gas generated in and leaving the catalyst retort is first fed into a space defined by this shield and thereafter released into furnace space. By this, an isolation of the catalyst retort from the interior of the furnace is provided, and relatively higher retort temperatures are available.

REFERENCES:
patent: 3535074 (1970-10-01), Nakashima
patent: 4398971 (1983-08-01), Peterson
patent: 4417927 (1983-11-01), Fullman
patent: 4531984 (1985-07-01), Madsac
patent: 4596610 (1986-06-01), Kuhn
patent: 5069728 (1991-12-01), Rancon et al.

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